Sentry's Turbo Build Thread Extravaganza!
i'm really happy for you ..
03-17-2009, 09:03 PM
#504
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I started it and ran it for a good 5 minutes while I data logged, the thing is running like a kitten now. I'm updating the tune now, hopefully it doesn't smoke me out this time, I was running ungodly rich the first time. 
03-17-2009, 09:14 PM
#505
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yay your running....im charging my tuner as we speak...so i can tune for 14-16lbs.....cant go much more cuz of the 2 piece intake manifold....ill eventually upgrade...but 14-16 should be fun for now
03-17-2009, 09:20 PM
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03-17-2009, 09:57 PM
#510
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Well, he's having issues with the MAF pipe I have. Apparently, 3" is way too big. He's got it tuned for 2.5", and when I go up to the 3, it's causing all sorts of issues. We're working on it. How am I supposed to get vids when I have no camera? 
03-18-2009, 09:28 AM
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well...as i went to datalog yesterday...my mbc **** itself....so now im only doing 7lbs...o and the initial tune is super rich....lol....no worries...i ordered a better mbc...like the one i have on the saab...capable of 35psi....so i should get that tomorrow hopefully
03-18-2009, 09:46 AM
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well...as i went to datalog yesterday...my mbc **** itself....so now im only doing 7lbs...o and the initial tune is super rich....lol....no worries...i ordered a better mbc...like the one i have on the saab...capable of 35psi....so i should get that tomorrow hopefully
Well that sucks, you need to break in your engine a little more anyways. I wouldn't start beating on it til at least 1000 mi.
03-18-2009, 10:04 AM
#515
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well i put 1400 miles into it already...lol....highway miles....talk about breaking it in fast...lol
03-18-2009, 11:14 AM
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The issue we're running into with the MAF pipe is this:
With the size pipe that is being run, the MAF frequency is so low, its off the bottom of the MAF scale in the ECM. There are two ways this could be worked around in the tune:
1. Scale the MAF tables down so the airflow calculations are correct. The problem here is there's no "resolution" so fueling might be non-precise at idle.
2. Switch to a hybrid SD/MAF fueling mode where we switch to MAF only after airflow is high enough to register in the MAF tables
There may end up being other problems since the MAF is used for more than just fueling. We're going into uncharted territory, either we'll be able to fix this in the tune or we'll have to switch to a smaller MAF tube.
With the size pipe that is being run, the MAF frequency is so low, its off the bottom of the MAF scale in the ECM. There are two ways this could be worked around in the tune:
1. Scale the MAF tables down so the airflow calculations are correct. The problem here is there's no "resolution" so fueling might be non-precise at idle.
2. Switch to a hybrid SD/MAF fueling mode where we switch to MAF only after airflow is high enough to register in the MAF tables
There may end up being other problems since the MAF is used for more than just fueling. We're going into uncharted territory, either we'll be able to fix this in the tune or we'll have to switch to a smaller MAF tube.
03-18-2009, 01:14 PM
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same problem im having with the maf car idles fine with the tune but as soon as i step on the gas it shuts off ..
03-18-2009, 01:23 PM
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Could also be MAF proximity to the TB and/or alignment with the TB. I've asked Sentry for pictures of his setup. I'm working with mrsilent also, who has a 3" MAF tube and his car DOESN'T have this problem (MAF reports airflow "normally")
Big-Dave has exactly the same issue - MAF frequency is off the scale on the low end. Big-Dave could you send me pictures of your MAF, and MAF Pipe also?
Big-Dave has exactly the same issue - MAF frequency is off the scale on the low end. Big-Dave could you send me pictures of your MAF, and MAF Pipe also?
03-18-2009, 05:02 PM
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03-18-2009, 05:08 PM
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how far away from the TB should your MAF be? mines going to be in the 3" pipe too.. ugh not liking this!
doe sthis mean the tune i got vince is no good?
doe sthis mean the tune i got vince is no good?
Last edited by pykie; 03-18-2009 at 05:08 PM. Reason: Automerged Doublepost
03-18-2009, 05:15 PM
#525
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